My old nipple started leaking, bought this, removed old, put teflon tape around new, screwed in with some torque and the tank fills and holds the fill no problem now!

Definitely need a small bolt tightening wrench with a recommended (55lbs of torque-I think) to install. DON'T OVER TIGHTEN, if you shake the tank you should be able to hear a little rattle coming from the nipple (not sure what it is or why, but reading online that seemed to be the consensus).